Which phase involves symptoms like fatigue, malaise, and low-grade fever?

The prodromal phase is characterized by the onset of non-specific symptoms that indicate the beginning of an illness. During this phase, individuals often experience fatigue, malaise, and low-grade fever, which are common signs signaling that the body's immune system is responding to an infection. This phase typically precedes the more acute or specific symptoms of the illness and can vary in duration from days to weeks, depending on the disease. Recognizing these initial symptoms is crucial for early intervention and treatment, as they represent the body's initial response to a pathogen before the full expression of the disease occurs.